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Heat transfer characteristics for double water‐jets on thick plates with various jet velocities and heights

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Abstract

During cooling, the array jet impact can achieve a rapid and uniform cooling of the high-temperature plate. Previous research results mostly focused on single-jet cooling of thin plates, but the complex flow and heat transfer characteristics between multiple jets could not be obtained. To clarify the heat transfer mechanisms and cooling speed fields characteristics in different flow regions, double water-jet impingement experiments were carried out on an AISI 304 austenitic stainless-steel plate with a thickness of 50 mm. The jet exit velocity was set to 2.95, 5.90, 8.06, and 11.80 m/s, while the jet height was set to 50, 150, 250, 350, and 450 mm. Pure water was selected as the working fluid with a constant temperature of 12.8 °C. The results show that a complex trend with sequential increasing, decreasing, and increasing behaviors appears in the wetting front width, upon increasing the wetting region diameter. The confluence fluid was found to reduce the influence caused by different jet velocities and to increase the influence caused by different jet heights. In addition, it was found that an excessive amount of accumulated fluid reduces the heat transfer efficiency during transition boiling. Finally, the correlations between maximum heat flux and average maximum cooling speed were established, which provide useful data for optimizing the cooling technology.

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Abbreviations

ρ s :

density of the experimental material Kg/m3

c s :

specific heat of the experimental material J/(kg·K)

h :

the distance to the cooled surface mm

t :

cooled time s

z :

jet height mm

Q :

jet flow L/h

u :

jet exit velocity m/s

Y :

filtered temperature °C

x :

measured temperature °C

K :

measured point mm

M :

time step s

λ s :

thermal conductivity of the experimental material W·(m·K) -1

r :

the horizontal distance between the surface position and jet point; mm

t min :

rewetting time s

T min :

rewetting temperature °C

t max :

complete-wetting time s

T max :

complete-wetting temperature °C

q max :

the maximum heat flux MW/m2

d :

nozzle diameter mm

Grad:

temperature gradient °C/mm

v max :

the maximum cooling speed °C/s

v ave :

the average maximum cooling speed along the horizontal °C/s

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Funding

This work was supported by the National Key Research and Development Programs of China (Grant number [2017YFB0305102]).

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Authors and Affiliations

  1. State Key Laboratory of Rolling and Automation, Northeastern University, 110819, Shenyang, China

    Xiuhua Tian, Tianliang Fu, Zhaodong Wang & Guodong Wang

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  1. Xiuhua Tian
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  2. Tianliang Fu
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  3. Zhaodong Wang
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  4. Guodong Wang
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Correspondence to Tianliang Fu.

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Tian, X., Fu, T., Wang, Z. et al. Heat transfer characteristics for double water‐jets on thick plates with various jet velocities and heights. Heat Mass Transfer 57, 1707–1715 (2021). https://doi.org/10.1007/s00231-021-03062-5

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